I'm curious, how much voltage would be required to pull this off? I've got the ultralite mkI

The one thing he did that I wouldn't do is tie the MOTU output XLR pin 3's to ground as indicated in the schematic. That is the same issue that's been discussed here at length about possible long term damage to the interface outputs. Pin 3 will be (trying to) output the inverse voltage of whatever voltage is at Pin 2. Pin 3 needs to float rather than be tied to ground per Stretta/MOTU - and they should know. Does your Ultralite even have balanced outs though?? Pin 3 might be a non-issue for you. If that's the case, getting enough voltage out will probably be the main issue, especially if the outputs are -10db unbalanced. I was able to get a maximum of about 2V out of the unbalanced RCA outs of a MOTU 2408 which is enough to trigger some gear and not enough for others, especially older stuff. Doesn't the DIN-sync Start-Stop need to be 5V? Well, that's the spec anyway. As STG basically said, how older DIN-Sync units will actually respond is anyone's guess. It may be worth mentioning that the Start-Stop is a steady +5V when running and 0V when stopped. I mistakenly thought this was a 5V pulse when I was experimenting with this a while back.

Reason is a good tool for this task and theoretically so will Numerology be, though I don't know of anyone who has reported doing this exact thing with it. I did something different but similar within Digital Performer sans the Start/Stop voltage you need for Din Sync. br> br>